Lecture-14-Neurons_39004

Lecture-14-Neurons_39004 - NervousSystems

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Nervous Systems Neurons: the functional units that utilize pulses of electric current to Neurons can transfer information over long distances via electrical ypes of information communicated: sensory control autonomic Types of information communicated: sensory, control autonomic e information processing network The information processing network – External/internal stimuli Æ sensory neurons ( afferent ) detect – Interneurons of CNS (process formation) to information) to… – Motor neurons or other efferent neurons (response/action) to effectors (muscles, organs, glands) Nerves : bundles of neurons
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Neuron Anatomy Glial cells: supportive functions for neurons: Dendrites: receive signals from other Cell Body: ntains ucleus regulate extra cellular fluid, insulate axons, rovide nutrients. neurons contains nucleus, Axon hillock: generation of electrical gnals that travel down the axon provide nutrients. signals that travel down the axon Synaptic terminals: junctions ( synapses ) between axon branches of a pre synaptic cell with dendrites of a Axon: ansmits signals post synaptic cell; communicate via neurotransmitters . transmits signals to other cells
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Membrane Potentials myriad of solute molecules exists in, and around, all cells. Many of A myriad of solute molecules exists in, and around, all cells. Many of these are charged atoms and molecules. • Cellular transport processes generate concentration differences of these molecules across the cell membrane. •A s a result, a charge imbalance occurs across the plasma membrane nerating a embrane potential generating a membrane potential : membrane ide A ide B side A side B + + + side A side B + Move 3 ions from ide B + + + side B to side A + 9 +, 6 3 +, 6 he charges on both sides +, 6 + 6 opposite harges are The charges on both sides are re arranged as follows 6 +, 6 6 +, 6 No membrane potential (No Charge Difference) cag e sae
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h a r g e “sorting” occurs as the surplus positive charges on one side (A) are attracted to the surplus of negative charges on the opposite side (B) of the membrane: side A side B + + + + 6 + 6 + + + + 9 +, 6 3 +, 6 Remainder of fluid neutral Separated charges reate potential Remainder of fluid neutral create potential This generates an electrochemical potential : due to the forces of Produces a voltage . Greater charge difference across membrane = higher voltage All cells have such a membrane potential
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This note was uploaded on 04/23/2010 for the course BIOL 1361 taught by Professor Knapp during the Spring '05 term at University of Houston.

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Lecture-14-Neurons_39004 - NervousSystems

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